RE: [SI-LIST] : Physcially-small far-end LVDS terminations?

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From: Ingraham, Andrew (Andrew.Ingraham@compaq.com)
Date: Tue Dec 21 1999 - 11:25:29 PST


>There is another point over here, which was sort of discussed here
>on the list which is , WHAT IS DIFFERENTIAL SIGNALLING?
>e.g.
>CML/pCML have "both" the currents (diff. magnitude) sinking "into" the
>differential pair.
>ECL/pECL have "both" the currents (diff. magnitude) sourceing "out of"
>the device.
>LVDS fits into my concept of diffreential that the same magnitude current
>flows in both the wires/tracks but in opposite direction.One sourcing
>and other sinking.

The main difference is the DC common-mode current. If you removed the DC
component, the switching currents in CML/ECL become fully complementary or
differential.

On the other hand, the drivers are asymmetrical, so rise/falltimes might not
match.

Regards,
Andy

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